方解石:我们可以重写优化的RelNode吗? [英] Calcite: can we rewrite the optimized RelNode?

问题描述

在方解石中，通过默认VolcanoPlanner提供的优化后，我们可以获得优化的RelNode，但是我们可以进一步优化吗?例如，我想添加ElasticsearchSort或类似的东西来限制我们处理的数据集.

In Calcite, after optimization provided by the default VolcanoPlanner, we can get an optimized RelNode, but can we have a further optimization? For example I want to add an ElasticsearchSort or something like that to limit the dataset we handle.

有人建议我们可以定义一个RelOptRule，但是由于VolcanoPlanner以dynamic programming方式处理优化，因此不确定是否可以正确的顺序应用规则.有什么想法吗?

Someone suggests we can define a RelOptRule, but since VolcanoPlanner handles the optimization in dynamic programming way, not sure if the rule can be applied in the right order. Any ideas?

推荐答案

您不必使用VolcanoPlanner.还有HepPlanner，它只应用您给它提供的作为HepProgram的规则.

You don't have to use VolcanoPlanner. There's also HepPlanner which just applies the rules that you give it as a HepProgram.

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